Coal-mining machine



(NoM odel) l s. 'MQALLISTER.

' H GOAL MINING MACHINE No; 373.081. Patented Nov. 15, 1887.

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SAMUEL MOALLISTER, OF NOBLESTOWN, ASSIGNOR OF ONE-HALF TO 0. D. LEVIS,OF PITTSBURG, PENNSYLVANIA.

COAL-MINING MACHINE.

SPECIFICATION forming part of Letters Patent No. 373,081, dated November15, 1887.

Application filed March 13, 1885. Renewed April 4, 1887. Serial No.233,671. (No model.)

To (ZZZ whom it may concern:

Be it known that I, SAMUEL MoALLIsrEn, a subject of the Queen of GreatBritain, and a resident of Noblestown, in the county of Allegheny andState of Pennsylvania, have invented a new and useful ImprovementinMachines for Mining Goal, of which the following is a specification.

My invention relates to that class of coal- [0 mining machines whereinlarge circular saws are arranged in a suitable frame a little dis tanceapa t on a common axle and made to cut the bank or body of coal inseparate hori-' zontal planes by means of one or more port able enginesdiiven by steam or compressed air; and the nature of my inventionconsists in the construction, arrangement, and combination of parts, asare hereinafter set forth, and which will be readily understood from thefollowing description, taken in connection with the accompanyingdrawings, wherein- Figure 1 represents a side elevation of my improvedcoal-mining machine, with its horizontal saws, their supporting-frame,gearing,

and drivingengine; Fig. 2, a top view of the same, the upper saw having.been removed the better to show the parts.

To construct a coal mining machine in accordance with my invention Iprepare two large circular saws, A B, and attach one to each end ofashort stout shaft, 0, so that the sawsshall'occupy different butparallel planes on the same axial line and at a suitable distance apart.The saw-shaft G is supported by 5 proper bearings, d, in the arms 6 of asubstantial frame, D, and is provided with a centrally-located pinion orsmall cog-wheehf. Across the arms of the frame to the rear of thispinionfis arranged a second short shaft, 9, o providedrwith a cog-wheel,n, of much larger diameter than that just before mentioned, and withwhich it engages. On each end of the shaft 9, carrying the largertoothed wheel, is afiixed a crank, 2', each connected to the crossheadjand piston'rod k of an engine, E, by means of a suitable link, Z,whereby a rapid rotary movement may be given to both saws, proportionedto the speed of the engine and the character of the intermediategearing.

This engine E consists of two cylinders, F G, arranged side by side, andprovided Withthe usual valve-chest, H, and inlet-pipe I, c0mmon to both,and such other appliances as may be necessary for making'the apparatuseffective, the steam or compressed air for driving the engine beingconveyed thereto by means of a flexible pipe. Attached to this engineunderneathits cylinders F G are oneor more small small wheels, m, orcasters, the axis of which is fixed to turn easily in any direction. Tothe ends of the cylinders most remote from the saws arc affixed a coupleof handles, 19, by which the engine may be thrust forward,drawn back, ormoved about on its casters to any desired position. The engines, frame,gearing, and operative parts being within the space between the sawsmake the apparatus very compact.

In coal-mining with this machine the operator thrusts forward the engineuntil its rapidly-revolving saws A B come in contact with the face ofthe coal-bed, the under saw being as low down as convenient for easywork-that is, nearly on a level with the floor of the pit whereupon by acontinued thrust forward of the machine the coal will be cut in twoparallel planes one above the other and as far in as the saws will reachwithoutinterfering with their driving mechanism; and this operation maybe conducted against and along the entire face of the exposed coal,which, when undercut by this machine, can be knocked down and removedafter the manner usual in such cases.

Having thus briefly described myinvention, I claim- In a machine formining coal, the combination of two circular saws on the same shaft, theintermediate pinion on said shaft, a larger toothed wheel engagingtherewith, a shaft provided with a crank at each end for c0mmunicatingpower to said gearing and saws, a portable engine consisting of twocylinders provided with a pipe or means for supplying steam orcompressed air thereto, one or more small wheels or casters under saidengine, and handles whereby the entire apparatus may be thrust forward,drawn back, or guided in any direction, for the purposes set forth.

SAMUEL MO ALLISTER.

Witnesses:

W. O. BARR, M. E. HARRISON.

